Note: “Social distancing” also includes a reduction in large gatherings; some school closures and working from home; and efforts to support hospitals and diagnostic testing. Based on a simulation between January and late October using…

The COVID-19 pandemic has caused a series of traumas that make each of us rethink the meaning of our humanity. Efforts to slow the spread of the disease have demanded enormous sacrifices. We have seen health care workers and others on the front…

LONDON — Prime Minister Boris Johnson has tested positive for the coronavirus and is suffering mild symptoms, the British government said on Friday, becoming the first leader of a major Western country known to have contracted the virus.